摘要
用热重法（ＴＧＡ）研究了惰性气氛下聚芳醚酮酮（ＰＥＫＫ）的热分解动力学，发现ＰＥＫＫ的热分解符合无规引发裂解模型．由Ｏｚａｗａ等失重百分率法求得０～３０％失重百分率下反应的活化能在２３４．９～２４２．３ｋＪ／ｍｏｌ之间，频率因子Ａ值在１．５３８×１０１３～６．６３７×１０１３ｍｉｎ－１之间．随着失重百分率的增大，热分解反应活化能增大．结果表明，ＰＥＫＫ具有较高的热稳定性．预测氮气中２８０℃失重５％的热老化寿命为１５ａ．
The kinetics of thermal degradation of poly(aryl ether ketone ketone)was studieel by dynamic thermogravimetry in nitrogen.The results calculated from the kinetic models based on random initiation followed by rapid dispropornation and termination were good agreement with the experimental data.An isoconversional procedure developed by Ozawa was used in this paper,and E was increased from 234.9 kJ/mol to 242.3 kJ/mol with increase of the conversion from 0 to 30%.The frequency factor A was 1.538×10 13 min -1 to 6.637×10 13 min.The lifetime estimates indicated the 15 year lifetime temperature maximum of PEKK in nitrogen environment to be 280 ℃.The kinetic data indicates PEKK has excellent thermal stability.
出处
《江西师范大学学报（自然科学版）》
CAS
1998年第4期343-346,共4页
Journal of Jiangxi Normal University(Natural Science Edition)
基金
江西省自然科学基金
关键词
聚芳醚酮酮
热分解反应
动力学
热重分析
Poly(aryl ether ketone ketone),dynamic thermogravimetry,thermal degradation,kinetics lifetime
